new line, then port?

soo as much as verizon completely wipes the floor with att (at least in the nyc metro area) i'm hoping that because the new iphone is plastic/3g or because an act of god occurred, att's service will be something i can deal with.

question: i am not going to port my number over from verizon and pay a cancellation fee without trying ATT out again on the new iphone for myself. does anyone know if i can open a new line of service with a different number and if i decide to keep the iphone, port my number over and placed on that contract? or would i have to cancel the original att contract and pay prorated charges and then port my number over separately?

Basically, last night we went to AT&T to ask a couple questions prior to the iphone launch. The rep recommended we just sign up now with a couple of free phones and exchange them out next friday. We did this, and since we we are supposively under contract with Sprint we knew we'd pay an early termination fee, which was fine. They did the port electronically... and we had an issue with retentions from sprint interfering and basically telling us that our contract date was wrong and she would change it from 11/09 to August 2nd of this year. So we decided to wait it out a month to avoid the $400 ETF. Anyways, we still went ahead and signed up on 'temporary' lines for the time being, and specifically made sure that they can be ported at a later date which we plan to do august 3rd.

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